ISP: Telia Sonera Oyj
Type of Internet Connection: Fiber/Ethernet
Internet Connection Speed: 100/100mbs
Date & Time: 7/5/2015 @ 9:30 PM GMT+3 (Finland)
Frequency: Always during the last boss fight in The Great Gubal Library
Character Name: Nasibihc Tigerstone
Race: Lalafell
World: Sargatanas
Class/Level: Paladin 59
Area and Coordinates: Library last boss room.
Party or Solo: Party
NPC Name: -
Monster Name: Everliving Bibliotaph
In-Game Time: Doesn't matter.

Steps:
1) Fight against the Everliving Bibliotaph.
2) Use Paladin skill Tempered Will just before the knockback (Magic Burst I think it is called) - move.
3) Get knockbacked when you shouldn't according to Tempered Will's "Immune to knockback moves" effect.